Effects of Phosphate Rock on Absorption and Accumulation of Heavy Metals of Ryegrass in Heavy Metal Contaminated Soil

Abstract:

The effects of phosphates rock (PR) with different particle sizes {D97<4.26 (the diameters of 97% of the particles are less than 4.26 µm.), <36.83, <71.12 and <101.43 µm} and different concentration (2.5% and 5% content of try soil weight) on immobilizing heavy metal-contaminated soils by a perennial ryegrass greenhouse experiment are conducted. Results indicate that remediation effect of applying 5% content is more significant than 2.5%. Ryegrass biomass in shoots in the former applying content is much larger than the latter and for both roots and shoots, PR reduces the absorption and accumulation of Pb, Cu and Zn, but no significant influence on Cd. While adding the same amount of different sizes of PR doesn’t show significant differences between these treatments. Pb content at 5% level of the finest size of PR is the minimum, decreased by 33% and 56% compared to the control in roots and shoots respectively, which was also suitable for Zn, decreased by 12.65% and 39.61% respectively.

• Periodical: Applied Mechanics and Materials (Volumes 522-524)
• Pages: 752-757
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.522-524.752
• Online since: February 2014
• Authors: Ying Zhe Wang, Zhong Qiu Zhao*, Guang Yu Jiang
• Keywords: Concentration, Heavy Metal, Particle Size, Phosphate Rock (PR), Ryegrass

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